How do I change the Server Notifications Email address?

I have logged this as a Beginners Question but please feel free to move or I will repost if I am incorrect. I have two accts on my site....an admin acct and one I would use for day to day stuff. I sent a friend request from one to the other to make sure it worked and all worked perfectly. However, I noticed the email address says wordpress.at.mysite.com and wondered where I can change that to support or something not so obvious to wordpress. Thanks for any help guys.